Finish refactoring FixProcessor to use ChangeBuilder

pkg/analysis_server/test/services/correction/fix_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_dart.dart';
 import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:analysis_server/src/services/correction/fix_internal.dart';
@@ skipping 4512 matching lines @@
   test(throw 42);
 }
 ''');
     await assertHasFix(
         DartFixKind.CREATE_FUNCTION,
         '''
 main() {
   test(throw 42);
 }
 
-void test(arg0) {
+void test(param0) {
 }
 ''');
   }
 
   test_undefinedFunction_create_duplicateArgumentNames() async {
     await resolveTestUnit('''
 class C {
   int x;
 }
 
@@ skipping 182 matching lines @@
   test(null);
 }
 ''');
     await assertHasFix(
         DartFixKind.CREATE_FUNCTION,
         '''
 main() {
   test(null);
 }
 
-void test(arg0) {
+void test(param0) {
 }
 ''');
   }
 
   test_undefinedFunction_create_returnType_bool_expressions() async {
     await assert_undefinedFunction_create_returnType_bool("!test();");
     await assert_undefinedFunction_create_returnType_bool("b && test();");
     await assert_undefinedFunction_create_returnType_bool("test() && b;");
     await assert_undefinedFunction_create_returnType_bool("b || test();");
     await assert_undefinedFunction_create_returnType_bool("test() || b;");
@@ skipping 348 matching lines @@
     await assertHasFix(
         DartFixKind.CREATE_METHOD,
         '''
 class A<T> {
   main() {
     T t = new B().compute();
   }
 }
 
 class B {
-  dynamic compute() {}
+  compute() {}
 }
 ''');
   }
 
   test_undefinedMethod_create_generic_OK_literal() async {
     await resolveTestUnit('''
 class A {
   B b;
   List<int> items;
   main() {
@@ skipping 1787 matching lines @@
   @override
   final AnalysisError error;
 
   _DartFixContextImpl(this.resourceProvider, this.analysisDriver,
       this.astProvider, this.unit, this.error);
 
   @override
   GetTopLevelDeclarations get getTopLevelDeclarations =>
       analysisDriver.getTopLevelNameDeclarations;
 }